Name: Generic 4-Channel 5V Relay Module | High Current Switching | Opto-Isolated Control
Brand: Generic
SKU: OL-GEN-4CHRLYMOD
Price: 149.00 INR
Availability: InStock

Robust Load Handling

Effortlessly switch high-voltage and high-current AC/DC loads with exceptional reliability and safety.

Seamless Microcontroller Integration

Directly interfaces with 5V logic platforms like Arduino, simplifying setup and programming effortlessly.

Enhanced Circuit Protection

Opto-isolation safeguards sensitive control electronics from electrical noise and voltage surges effectively.

The Engineering Behind the 4-Channel 5V Relay Module

This 4-channel 5V relay module provides an essential interface for microcontrollers to control high-voltage or high-current loads. Featuring four independent single-pole, double-throw (SPDT) relays, typically Songle SRD-05VDC-SL-C, it enables precise switching of AC and DC devices. The module operates on a 5V DC control signal, making it directly compatible with popular development platforms, and often includes opto-couplers for critical electrical isolation between the control circuit and the high-power load.

Constructed with high-quality PCB and robust terminal blocks, the module ensures secure connections and long-term durability in demanding environments. Each relay is rated for a substantial current and voltage, providing a reliable switching solution for applications ranging from home automation to industrial control systems, all while protecting sensitive microcontroller circuitry from inductive kickback.

Opto-Isolated Control Interface

The integrated opto-couplers provide galvanic isolation between the low-voltage control side (microcontroller) and the high-voltage load side. This critical feature prevents ground loops, protects the microcontroller from voltage spikes and noise generated by the load, and enhances overall system safety and stability, particularly when switching inductive loads.

Flexible SPDT Switching Configuration

Each of the four relays is a Single-Pole, Double-Throw (SPDT) type, offering both Normally Open (NO) and Normally Closed (NC) contacts. This dual-state capability allows for versatile circuit design, enabling users to either close a circuit (NO) or open a circuit (NC) when the relay is energized, providing maximum flexibility for various switching requirements and fail-safe implementations.

Optimized for Performance & Integration

Channels: 4 independent relay channels
Control Voltage: 5V DC (typically TTL logic)
Load Voltage (Max): 250V AC / 30V DC
Load Current (Max): 10A per channel
Isolation: Opto-isolated inputs
Indicators: LED status indicators for each channel
Mounting: Standard mounting holes provided

Features & Benefits

4 Independent Channels: Simultaneously control multiple devices, expanding project automation capabilities.
5V Logic Compatibility: Directly interface with Arduino, Raspberry Pi, and other 5V microcontrollers without level shifters.
Opto-Isolated Inputs: Provides crucial electrical isolation, safeguarding your sensitive control electronics from high-voltage spikes.
High Current Switching: Each relay handles up to 10A at 250VAC/30VDC, suitable for demanding power loads.
Normally Open (NO) & Normally Closed (NC) Contacts: Offers versatile switching configurations for diverse application requirements.
LED Status Indicators: Visually confirm relay activation status, simplifying debugging and operation monitoring.

Pro-Grade Advantages

High current and voltage switching capability for diverse loads.
Opto-isolation provides superior safety and noise immunity for control circuits.
Standard 5V control voltage ensures wide compatibility with popular MCUs.
LED indicators for quick visual status checks and troubleshooting.

Technical Considerations

Requires external power supply for relay coil if MCU current is insufficient.
Relays are mechanical devices with finite switching cycles, impacting lifespan over time.

What is the primary function of a 4-channel 5V relay module?

Its primary function is to enable low-voltage microcontrollers to safely control high-voltage or high-current electrical devices, acting as an electronically controlled switch.

Why is opto-isolation important in this relay module?

Opto-isolation provides galvanic separation between the control circuit and the load circuit, protecting the microcontroller from electrical noise, voltage spikes, and potential damage from the high-power side.

What types of loads can this relay module switch?

It can switch both AC and DC loads, such as lights, motors, pumps, solenoids, and other appliances, within its specified voltage and current limits (e.g., 250V AC / 30V DC at 10A).

Is an external power supply required for the relay module?

While the control signals are 5V, the relay coils themselves may draw significant current. If the microcontroller’s 5V rail cannot supply sufficient current (typically 15-20mA per relay), an external 5V power supply is recommended for reliable operation.

What is the difference between NO and NC contacts on the relay?

NO (Normally Open) contacts are open when the relay is de-energized and close when energized. NC (Normally Closed) contacts are closed when de-energized and open when energized, offering different default states for controlled circuits.

Specification	Value
Number of Channels	4
Control Voltage	5V DC
Rated Load Voltage (AC)	Up to 250V @ 10A
Rated Load Voltage (DC)	Up to 30V @ 10A
Isolation Method	Opto-Coupler (Galvanic Isolation)
Contact Type	SPDT (Normally Open, Normally Closed)
Activation Indicator	Individual Channel LEDs
Quiescent Current	~5mA
Max Operating Current	~70mA (all relays ON)

Additional information

Weight	0.065 kg
Dimensions	7.3 × 5.5 × 1.9 cm
Brand	Generic
Technology	Electromechanical Switching
Operating Voltage	250V AC / 30V DC (Load), 5V DC (Control)
Max Current	10A per channel
Channels	4
Control Interface	Digital Logic